Method of electric welding



T. E. MURRAY, JIL, AND J. B. MURRAY. METHOD OF ELECTRIC WELDING.APPLICATION FILED NOV.25, m9.

1,350,831 Patented Aug. 24, 1920.

K? 6] mus for; (kW new M fl Ma UNITED STATES:

PATENT, OFFICE- THOMAS E. MURRAY, an, AND JOSEPH B. MURRAY, or BROOKLYN,NEW YORK.

METHOD QF ELECTRIC WELDING.

To all whom it may concern:

Be 1t known that we, THOMAS E. More I RAY, J1'., and J OSEPH B.- MURRAY,citi'zens'of the United States, residing at Brooklyn, in the county ofKings. and State of New York, have i'nventeda certain new and usefulImprovement in Methods of Electrical which the followingis a specification. 1

\Vhere two thin plates'of metal are to be electrically welded edge toedge, and especially if said plates are bent into half sections of atube or like hollow object, it is difficult to get an exact registry ofsaid edges when the work is disposed in the electrodes of a weldingmachine; and even if said registry be obtained at the outset, 1t isdifficult to maintain it when welding currents of high/ampere stren h.and very brief duration are employed. The tendency of the shock. orexplosion due to said current is to cause a relative movement, or even acertain collapse, of the parts ofzthe work, with the result of throwinthe contacting surfaces out of' registry. onsequently the weld takesplace over the overlapped area only of the surfaces of the parts, andnot between the whole area of the said surfaces, and hence the joint ismuch weaker than would otherwise be the case and, besides, shows sharpledges. By our hereinafter v I utilize the metal fused and extruded atthe joint to fill the angles due to tl'ieoverlapping. We remove themetalso extruded on one side of the work, but leave the,extrude d metalon; the other side. The consequence I enlarged) to be-welded together attheir is, that-to the reduced area of surfacexcontact at the weld isadded the'area of contact furnished b. the extruded rnetal whichisinfact welde to both parts of the work,' and hence the whole area ofsurface contact at the jointis'thus restored, the same asif theparts'truly registered and did'not overlap, as described. I I

The accompanying drawing is an enlarged view of the parts of the platesto be welded which are adjacent to the welded 'oint. A and B are theedge portions of two thin metal plates (shown for clearness heremuchedges c andiD, We Will assumethat: said plates havebecome out ofregistry, so that 1 the Werlappingocdurs ata, bthe. re-" mainder of eachedge, as a, 0 and b, (i, being uncovered.- Obviously, the-joint .willthen theedge about, as shown at H.

described I method, .we

measure, say, only one-half of the surface themetal extruded from theweld enters the angles at E and F; The extruded metal in angle F issupported by the exposed surface I), d of the lower plate B. Therefore,

the upper plate A; any excess running'over This ex truded metal unitesitself to both plates, so that the joint is-now over asurface area- -Specification of Letters Patent. P t t d A g- 24 1920 ApplicationfiledNovember 25, 1919. Serial in; 340,609.

as it covers that surface and banksup against from a to (Z, equal tothat which; would be present were the edges C, D originally inregistry.- In making a definite hollow object, for example, as a hollowstandard or pedestal, we arrange that the metal in angle F shall be onthe inside of the work, and

hence not visible. ()n the outer or exposed side we cut off the extrudedmetal in angle E, and bevel the upper plate A from a to e, as indicatedby the dotted line.

In this way, we. obtain a welded joint quite as strong as obtainable atthe edges C and D had' they actually been in reglstry.

\Vhere the plates A and Bare thin say,

1 inch in thickness the slight protrusion of plate A beyond plate B(purposely exaggerated in the drawing) is not objection able; and incomparatively large objects such as a'pedestal, some three feet high, ascommonly used in creamseparators, it is hardly noticeable. I

We claim:

The'method of electrically welding thin metal parts in edge contact anddisposed so 'tha't'the contacting surface of one part overlaps thecontacting surface of the other part, which consists inestablishing theWelding current through the joint to unite said parts' andtoproduce anoutflow of extruded metal to fill the angles due to said,

overlapping, and then removing the metal xso extruded on-one side ofsaid parts, and

bevel-ing the portion of said part protrud- .-ing beyond the oppositepart; whereby the thickness of ,metal measured transversely across thejoint is rendered equal'to the norinal thickness of said parts.

Intestimony whereof we have afiixed our signatures in presence of twowitnesses.

THOMAS E. MURRAY, JR.

-JOSEPH B. MURRAY; Witnesses: f GERTRUDE T, PORTER,

MAY MGGARRY.

